OK Steve, Subtract .37 from the data and 3.3 volts is 150 psi.

 Here is the latest and greatest. 1 msec. 6.8 K bottom resistor and
 1.2 K top resistor. The resister junction goes to the MM pin 9. The top of
 the resistor divider goes to the out put of the .37 to 4 volt pressure
 sensor.

 Paul Lamar


Hi Paul

Chart is - Average Data - Subtract 0.375 Then Multiplied by 150/3.3

Of all the 3000 data samples, there was only 228 samples of actual rotor pumping.

Odd! The sample period appears the same as the 10mSec run.
MMBasic Ver 4.5 claims a min tick of 1mSec

Also, the 8 samples are very consistent so taking them and averaging appears superfluous.

Steve Izett

I have to run the MM program, run around the front of the airplane to behind the left wing,
over to the cockpit and  turn on the master switch and hit the red starter button on the far right
of the instrument panel for 30 seconds. Then run back around the front of the
airplane and stop the MM program :-)

The data file on the  MM 32 Gig SD card was then  about 229K.
Before I sent it to you I erased over 100K of samples taken at 1000 samples
per second :-)

When Pete is in the hangar he hits the starter button for me  just after the program
starts running. That cuts down on the number of useless samples.

The data looks great. One usually gets about 60 psi when rotating the engine
with the starter. The throttle was still closed. That rotor is in perfect condition.
That is quite understandable with ceramic apex seals.


Paul Lamar

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